This is really bad news. But wait, I thought this would matter only if you had a negative balance in dollars. But what if you have 10k dollars, and yet need 30k dollars of margin for your CME futures, and you have part of that margin in other currencies?

This is really bad news. But wait, I thought this would matter only if you had a negative balance in dollars. But what if you have 10k dollars, and yet need 30k dollars of margin for your CME futures, and you have part of that margin in other currencies?

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Well, you do not have the USD margin required then, do you? You are going to have to borrow it as far as I can see.

Now, the CME itself allows margin to be posted in multiple currencies, but I do not think that IB is going to do so. I could be wrong.

Great, thanks for the detailed information and the further details. Now the next question in my mind is how heavy is that interest charged. But, in case no one knows, I'll find out soon enough on my IB statements.

Great link and great news, too. Given that I will need precisely that 10k of extra margin only two or three times per week, and only on an intraday basis, all I have to fear is getting charged about 50 euros per year (52 weeks in a year, and getting charged fifty cents twice a week).

I consider it worth it to diversify, because I am at once protecting myself against the fall of any one currency and also at the same time I am investing in these currencies, which I am buying now while they're undervalued (CHF, GBP, JPY), so that I'll make a profit at least as large as the fees I will incur.